If the arithmetic mean of 1,2,3,4,5,6,x, 16 and 18 is 8.0, find the value of x?

  • A 7.0
  • B 6.0
  • C 8.5
  • D 17.0
jamb 2001economics

The correct answer is D. 17.0

8 x \(\frac{55 + x}{9}\)

cross multiply

9 x 8 = 55 + x

72 - 55 = 17

x = 17

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